A BV is a Big Virgin. He thinks he is better than everyone else because he waited until marriage to have sex, but the truth is that he is almost 30 and a virgin because he is either 1) afraid of vaginas or 2) confused about his sexuality 3) prefers comic books and video games over female company- or any combination of 1,2, or 3. In the end he marries the first female who offers him sex, often making a huge mistake.

friend 1: Who is that girl with the smelly cunt marrying?
friend 2: She's marrying some BV.
friend 3: Yeah! I hear he still has collection of smurfs in his dining room!
friend 2: Yeah, and his vagina gets wet at christmas time 'cause he really likes to set up his choo choo train set and decorate the house!! Ha ha!!